package com.test.mall.ware.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.baomidou.mybatisplus.core.toolkit.StringUtils;
import com.rabbitmq.client.Channel;
import com.test.common.exception.NoStockException;
import com.test.common.to.OrderTo;
import com.test.common.to.StockDetailTo;
import com.test.common.to.StockLockedTo;
import com.test.common.utils.R;
import com.test.mall.ware.entity.WareOrderTaskDetailEntity;
import com.test.mall.ware.entity.WareOrderTaskEntity;
import com.test.mall.ware.feign.OrderFeignService;
import com.test.mall.ware.feign.ProductFeignService;
import com.test.mall.ware.service.WareOrderTaskDetailService;
import com.test.mall.ware.service.WareOrderTaskService;
import com.test.mall.ware.vo.OrderItemVo;
import com.test.mall.ware.vo.OrderVo;
import com.test.mall.ware.vo.SkuHasStockVo;
import com.test.mall.ware.vo.WareSkuLockVo;
import lombok.Data;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.test.common.utils.PageUtils;
import com.test.common.utils.Query;

import com.test.mall.ware.dao.WareSkuDao;
import com.test.mall.ware.entity.WareSkuEntity;
import com.test.mall.ware.service.WareSkuService;
import org.springframework.transaction.annotation.Transactional;



@Service("wareSkuService")
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {

    @Autowired
    WareSkuDao wareSkuDao;

    @Autowired
    OrderFeignService orderFeignService;

    @Autowired
    ProductFeignService productFeignService;

    @Autowired
    WareOrderTaskService orderTaskService;

    @Autowired
    WareOrderTaskDetailService orderTaskDetailService;

    @Autowired
    RabbitTemplate rabbitTemplate;



    private void unLockStock(Long skuId,Long wareId,Integer num,Long taskDetailId) {
        wareSkuDao.unLockStock(skuId,wareId,num);
        //库存工作单状态
        WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity();
        entity.setId(taskDetailId);
        entity.setLockStatus(2);//变为已解锁
        orderTaskDetailService.updateById(entity);
    }

    @Override
    public PageUtils queryPage(Map<String, Object> params) {

        QueryWrapper<WareSkuEntity> queryWrapper = new QueryWrapper<>();
        String skuId = (String) params.get("skuId");
        if(!StringUtils.isBlank(skuId)){
            queryWrapper.eq("sku_id",skuId);
        }
        String wareId = (String) params.get("wareId");
        if(!StringUtils.isBlank(wareId)){
            queryWrapper.eq("ware_id",wareId);
        }
        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params),
                queryWrapper
        );

        return new PageUtils(page);
    }

    @Override
    public void addStock(Long skuId, Long wareId, Integer skuNum) {
        List<WareSkuEntity> entities = wareSkuDao.selectList(new QueryWrapper<WareSkuEntity>().eq("sku_id", skuId).eq("ware_id", wareId));
        if(entities == null || entities.size()==0){
            WareSkuEntity skuEntity = new WareSkuEntity();
            skuEntity.setSkuId(skuId);
            skuEntity.setStock(skuNum);
            skuEntity.setWareId(wareId);
            skuEntity.setStockLocked(0);
            // TODO 远程查询sku的名字,如果失败整个事务不需回滚
            try {
                R info = productFeignService.info(skuId);
                Map<String,Object> data =(Map<String,Object>) info.get("skuInfo");

                if(info.getCode()==0){
                    skuEntity.setSkuName((String) data.get("skuName"));
                }
            }catch (Exception e){

            }
            wareSkuDao.insert(skuEntity);
        }else{
            wareSkuDao.addStock(skuId,wareId,skuNum);
        }
    }

    @Override
    public List<SkuHasStockVo> getSkusHasStock(List<Long> skuIds) {

        List<SkuHasStockVo> collect = skuIds.stream().map(skuId -> {
            SkuHasStockVo vo = new SkuHasStockVo();
            Long count = baseMapper.getSkuStock(skuId);

            vo.setSkuId(skuId);
            vo.setHasStock(count==null?false:count>0);

            return vo;
        }).collect(Collectors.toList());
        return collect;
    }

    /**
     * 为某个订单锁定库存
     * @param vo
     * @return
     */
    @Transactional(rollbackFor = NoStockException.class)
    @Override
    public Boolean orderLockStock(WareSkuLockVo vo) {

        WareOrderTaskEntity taskEntity = new WareOrderTaskEntity();
        taskEntity.setOrderSn(vo.getOrderSn());
        orderTaskService.save(taskEntity);
        //按照下单收货地址，找到就近仓库，锁定仓库
        //找到每个商品在那个仓库有库存
        List<OrderItemVo> locks = vo.getLocks();

        List<SkuWareHasStock> collect = locks.stream().map(item -> {
            SkuWareHasStock stock = new SkuWareHasStock();
            Long skuId = item.getSkuId();
            stock.setSkuId(skuId);
            stock.setNum(item.getCount());
            //查询这个商品在哪里有库存
            List<Long> wareIds = wareSkuDao.ListWareIdHasStock(skuId);
            stock.setWareId(wareIds);
            return stock;
        }).collect(Collectors.toList());

        Boolean allLock = true;
        //锁定库存
        for (SkuWareHasStock hasStock : collect) {
            Boolean skuStocked = false;
            Long skuId = hasStock.getSkuId();
            List<Long> wareIds = hasStock.getWareId();
            if (wareIds == null || wareIds.size()==0) {
                //没有库存，抛出异常
                String msg = "库存不足";
                throw new NoStockException(msg);
            }

            //如果每一个商品都锁定成功,将当前商品锁定了几件的工作单记录发送给MQ
            //如果锁定失败。前面保存到的工作单信息回滚了
            for (Long wareId : wareIds) {
                Long count = wareSkuDao.lockSkuStock(skuId,wareId,hasStock.getNum());
                if (count == 1) {
                    skuStocked = true;
                    WareOrderTaskDetailEntity taskDetailEntity = new WareOrderTaskDetailEntity(null,skuId,"",hasStock.getNum(),taskEntity.getId(),wareId,1);
                    orderTaskDetailService.save(taskDetailEntity);
                    StockLockedTo lockedTo = new StockLockedTo();
                    lockedTo.setId(taskEntity.getId());
                    StockDetailTo stockDetailTo = new StockDetailTo();
                    BeanUtils.copyProperties(taskDetailEntity,stockDetailTo);
                    //只发id不行,防止找不到
                    lockedTo.setDetail(stockDetailTo);
                    rabbitTemplate.convertAndSend("stock-event-exchange","stock.locked",lockedTo);
                    break;
                } else {
                    //当前仓库锁失败了
                }
            }
            if (skuStocked == false) {
                //当前商品所有都没有锁住
                String msg = "当前商品所有都没有锁住";
                throw  new NoStockException(msg);
            }
        }
        //肯定全部都是锁定成功
        return true;
    }

    @Override
    public void unlockStock(StockLockedTo to) {
        StockDetailTo detail = to.getDetail();
        Long detailId = detail.getId();
        //查询数据库关于这个订单的锁定情况
        //有：需要解锁
        //没有：库存锁定本身就失败了，这种情况无需解锁
        WareOrderTaskDetailEntity byId = orderTaskDetailService.getById(detailId);
        if (byId != null) {
            //解锁
            Long id = to.getId();
            WareOrderTaskEntity taskEntity = orderTaskService.getById(id);
            String orderSn = taskEntity.getOrderSn();
            R r = orderFeignService.getOrderStatus(orderSn);
            if (r.getCode() == 0) {
                //订单数据返回成功
                OrderVo data = r.getData(new TypeReference<OrderVo>() {
                });
                if (data == null || data.getStatus() == 4) {
                    //订单不存在
                    //订单已经被取消了,才能取消库存
                    if (byId.getLockStatus() == 1) {
                        //当前库存单已锁定才能锁定
                        unLockStock(detail.getSkuId(), detail.getWareId(), detail.getSkuNum(), detailId);
                    }
                }
            } else {
                //消息拒绝以后重新放到队列里面，让其他队列消费解锁
            }
        } else {
            //无需解锁
            throw new RuntimeException("远程服务失败");
        }
    }

    //防止订单服务卡顿导致订单状态改不了，库存消息优先到期。查订单状态新建状态，什么都不做就走了，导致卡顿的订单，永远不能解锁库存
    @Transactional
    @Override
    public void unlockStock(OrderTo orderTo) {
        String orderSn = orderTo.getOrderSn();
        //查一下库存解锁最新状态
        WareOrderTaskEntity task = orderTaskService.getOrderTaskByOrderSn(orderSn);
        Long id = task.getId();
        //按照工作单找到所有没有解锁的库存进行解锁
        List<WareOrderTaskDetailEntity> entities = orderTaskDetailService.list(new QueryWrapper<WareOrderTaskDetailEntity>()
                .eq("task_id", id)
                .eq("lock_status", 1));
        for (WareOrderTaskDetailEntity entity : entities) {
            unLockStock(entity.getSkuId(),entity.getWareId(),entity.getSkuNum(),entity.getId());
        }

    }

    @Data
    class SkuWareHasStock{
        private Long skuId;
        private Integer num;
        private List<Long> wareId;
    }
}